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A long-life organic room temperature phosphorescent material and its preparation method and application

A room temperature phosphorescent, long-life technology, applied in the direction of luminescent materials, chemical instruments and methods, nano optics, etc., can solve the problems of complex preparation process of phosphorescent materials, scarcity of preparation raw materials, poor optical properties, etc., to promote triplet phosphorescence emission, The effect of pure organic raw materials and long decay time

Active Publication Date: 2018-12-28
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The method of the present invention uses carbon quantum dots rich in N and O elements and urea as raw materials, and the solvent used is water. The raw materials are pure organic, non-toxic, cheap and easy to obtain, and the synthesis route is simple and easy to operate. , the reaction conditions are mild, one-step microwave method can be synthesized, suitable for mass production, and solve the problems of complex preparation process, scarcity of preparation raw materials and poor optical properties of phosphorescent materials in the prior art; under microwave, the N-rich element The interaction between the carbon quantum dots of the O element and urea effectively inhibits the triplet non-radiative transition of the carbon quantum dots, thereby greatly promoting the triplet phosphorescent emission; the prepared room temperature phosphorescent material has a high quantum yield at room temperature and air, Long decay time

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  • A long-life organic room temperature phosphorescent material and its preparation method and application
  • A long-life organic room temperature phosphorescent material and its preparation method and application
  • A long-life organic room temperature phosphorescent material and its preparation method and application

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Embodiment 1

[0025] This embodiment provides a method for preparing a long-life organic room temperature phosphorescent material, which includes the following steps:

[0026] (1) Dissolving 1g of folic acid and 1g of urea in 100ml of deionized water, fully stirring to obtain a mixed solution;

[0027] (2) Place the mixed solution obtained in step (1) in a 200ml polytetrafluoroethylene autoclave, and heat it at 260°C for 2 hours to obtain an initial solution of carbon quantum dots;

[0028] (3) Centrifuge the initial solution obtained in step (2) at a speed of 9500 rpm for 20 minutes to remove the black precipitate in the lower layer, take the brownish-yellow clear liquid in the upper layer, and freeze-dry the brownish-yellow clear liquid in the upper layer for 72 hours to obtain black Carbon quantum dot powder rich in N and O elements, and then the carbon quantum dot powder is formulated into a 5mg / ml carbon quantum dot aqueous solution; after testing, the mass fractions of C, N, and O in ...

Embodiment 2

[0032] This embodiment provides a method for preparing a long-life organic room temperature phosphorescent material, which includes the following steps:

[0033] (1) Dissolving 1g of folic acid and 1g of urea in 100ml of deionized water, fully stirring to obtain a mixed solution;

[0034] (2) Place the mixed solution obtained in step (1) in a 200ml polytetrafluoroethylene autoclave, and heat it at 260°C for 2 hours to obtain an initial solution of carbon quantum dots;

[0035] (3) Centrifuge the initial solution obtained in step (2) at a speed of 9500 rpm for 20 minutes to remove the black precipitate in the lower layer, take the brownish-yellow clear liquid in the upper layer, and freeze-dry the brownish-yellow clear liquid in the upper layer for 72 hours to obtain black Carbon quantum dot powder rich in N and O elements, and then the carbon quantum dot powder is formulated into a 5mg / ml carbon quantum dot aqueous solution.

[0036] (4) 100 μl of aqueous solution of carbon q...

Embodiment 3

[0039] This embodiment provides a method for preparing a long-life organic room temperature phosphorescent material, which includes the following steps:

[0040] (1) Dissolving 1g of folic acid and 1g of urea in 100ml of deionized water, fully stirring to obtain a mixed solution;

[0041] (2) Place the mixed solution obtained in step (1) in a 200ml polytetrafluoroethylene autoclave, and heat it at 260°C for 2 hours to obtain an initial solution of carbon quantum dots;

[0042] (3) Centrifuge the initial solution obtained in step (2) at a speed of 9500 rpm for 20 minutes to remove the black precipitate in the lower layer, take the brownish-yellow clear liquid in the upper layer, and freeze-dry the brownish-yellow clear liquid in the upper layer for 72 hours to obtain black The carbon quantum dot powder that is rich in N, O element, then described carbon quantum dot powder is made into the carbon quantum dot aqueous solution of 5mg / ml.

[0043] (4) Take step (3) gained carbon q...

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Abstract

The invention belongs to the technical field of luminescent materials, and particularly relates to long-life organic indoor temperature phosphor materials and a preparation method and application thereof. The preparation method comprises the following steps that S1, 1-100 parts by weight of carbon quantum dots which are rich in N elements and O elements and 20,000 parts by weight of urea are mixed and dissolved in water, and then stirred evenly and reaction mixed liquid is obtained; S2, the reaction mixed liquid obtained in the step S1 is placed in a microwave oven to be heated until a solid appears, cooling and grinding are conducted sequentially, and then the long organic indoor temperature phosphor materials are obtained. The preparation method has the advantages that raw materials are purely organic, have no toxicity condition and are low in price, the synthetic route is simple, the reaction condition is moderate and the preparation method is suitable for large-scale production. The prepared indoor temperature phosphor materials are high in quantum yield and long in fall time, and have enormous popularization and application value in the fields of anti-counterfeiting, information encryption, photovoltaic devices and the like.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a long-life organic room-temperature phosphorescent material and its preparation method and application. Background technique [0002] Organic room-temperature phosphorescent material is a material that does not contain heavy metals and can observe phosphorescence at room temperature. Compared with transition metal compounds, it is less expensive, safe and non-toxic, and plays an important role in various fields such as information encryption, anti-counterfeiting, and photovoltaic devices. application value. However, organic room-temperature phosphorescent materials are very scarce and difficult to prepare, and the existing preparation methods are not suitable for large-scale production. In order to obtain effective phosphorescent emission, it is generally necessary to design and synthesize a specific molecular structure. The synthesis process is comple...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/07C01B32/15B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/07
Inventor 周明李奇军
Owner TSINGHUA UNIV